Move some errors to their own sub packages (#32880)

modules/git/remote.go

@@ -5,8 +5,12 @@ package git
 
 import (
 	"context"
+	"fmt"
+	"net/url"
+	"strings"
 
 	giturl "code.gitea.io/gitea/modules/git/url"
+	"code.gitea.io/gitea/modules/util"
 )
 
 // GetRemoteAddress returns remote url of git repository in the repoPath with special remote name
@@ -37,3 +41,61 @@ func GetRemoteURL(ctx context.Context, repoPath, remoteName string) (*giturl.Git
 	}
 	return giturl.Parse(addr)
 }
+
+// ErrInvalidCloneAddr represents a "InvalidCloneAddr" kind of error.
+type ErrInvalidCloneAddr struct {
+	Host               string
+	IsURLError         bool
+	IsInvalidPath      bool
+	IsProtocolInvalid  bool
+	IsPermissionDenied bool
+	LocalPath          bool
+}
+
+// IsErrInvalidCloneAddr checks if an error is a ErrInvalidCloneAddr.
+func IsErrInvalidCloneAddr(err error) bool {
+	_, ok := err.(*ErrInvalidCloneAddr)
+	return ok
+}
+
+func (err *ErrInvalidCloneAddr) Error() string {
+	if err.IsInvalidPath {
+		return fmt.Sprintf("migration/cloning from '%s' is not allowed: the provided path is invalid", err.Host)
+	}
+	if err.IsProtocolInvalid {
+		return fmt.Sprintf("migration/cloning from '%s' is not allowed: the provided url protocol is not allowed", err.Host)
+	}
+	if err.IsPermissionDenied {
+		return fmt.Sprintf("migration/cloning from '%s' is not allowed.", err.Host)
+	}
+	if err.IsURLError {
+		return fmt.Sprintf("migration/cloning from '%s' is not allowed: the provided url is invalid", err.Host)
+	}
+
+	return fmt.Sprintf("migration/cloning from '%s' is not allowed", err.Host)
+}
+
+func (err *ErrInvalidCloneAddr) Unwrap() error {
+	return util.ErrInvalidArgument
+}
+
+// ParseRemoteAddr checks if given remote address is valid,
+// and returns composed URL with needed username and password.
+func ParseRemoteAddr(remoteAddr, authUsername, authPassword string) (string, error) {
+	remoteAddr = strings.TrimSpace(remoteAddr)
+	// Remote address can be HTTP/HTTPS/Git URL or local path.
+	if strings.HasPrefix(remoteAddr, "http://") ||
+		strings.HasPrefix(remoteAddr, "https://") ||
+		strings.HasPrefix(remoteAddr, "git://") {
+		u, err := url.Parse(remoteAddr)
+		if err != nil {
+			return "", &ErrInvalidCloneAddr{IsURLError: true, Host: remoteAddr}
+		}
+		if len(authUsername)+len(authPassword) > 0 {
+			u.User = url.UserPassword(authUsername, authPassword)
+		}
+		remoteAddr = u.String()
+	}
+
+	return remoteAddr, nil
+}